他换工作太频繁，我无法再跟上了。

He changes jobs so often I can’t ___keep ___track anymore.

一定要留意时间，以免迟到。

Be sure to ___keep ___track of the time so you won't be late.

试图通过翻译来跟踪这些变化将是不合适的任务。

Trying to ___keep ___track of these changes by translating them would be an inappropriate task.